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Abstract

Steam condensation heat transfer measurements were made
in a 5-tube test condenser having an additional perforated
tube to simulate up to 30 active tubes. Results were
obtained for smooth tubes and roped tubes wrapped with wire.
A Sieder-Tate equation was used to correlate the inside
heat-transfer coefficient. For smooth tubes, a leading
coefficient of 0.029 was found, while it was 0.061 for the
roped tubes. The average condensing coefficient measured
for 30 smooth tubes was 0.59 times the Nusselt coefficient
calculated for the first tube. When the smooth tubes were
wrapped with wire, this ratio increased up to 0.86.
Further, roped tubes without wire experienced a ratio of
0.63, while roped tubes wrapped with wire resulted in a
ratio of 0.86. These preliminary data show that wire-wrapped
tubes may lead to a significant reduction in
condenser surface area.

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